Transport Scotland has denied claims it is unwilling to meet furious motorists.
In a cutting response to A9 campaigners, the national organisation accused them of being more interested in hitting the headlines than seeking a solution.
Over the last few weeks, discussions have been ongoing about proposals for the introduction of average speed cameras between Dunblane and Inverness.
Earlier efforts to set up a meeting descended in to heated arguments and Mike Burns, who is spearheading the campaign, now claims that Transport Scotland chief executive David Middleton has refused to meet him for a second time.
A spokesman for the Scottish Government agency disputed this, saying their offer to meet “remains open”.
He said: “It’s well documented that we have offered to meet Mr Burns on numerous occasions to discuss the evidence that informed the A9 Safety Group’s decision on the average speed camera system.
“His constant refusal to meet is disappointing. Rather than generating headlines, we are interested in having a proper debate and discussion.”
Mr Burns, founder of the A9 Average Speed Cameras Are Not The Answer campaign, has called for the A9 Safety Group to be disbanded.
He believes that the release of official documents on its website raise “serious questions”.
He said: “It is becoming even more clear that the SPECS proposal is fundamentally flawed, based on insufficient evidence which does not take into account the real causes of accidents on the A9.
“The blunt instrument of average speed cameras shows a fundamental lack of understanding of the road, the problems, the frustrations and the characteristics.
“Furthermore, the A9 Safety Group must be disbanded in its current form. The closed door group has failed to deliver objectives, especially community engagement, and must become a public forum immediately, with balanced composition of members.”
Transport Scotland denied this, saying that the group was made up of representatives from both the public and private sectors.s